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SAP domain of structure-specific endonuclease subunit SLX4 and similar proteins SLX4, also called BTB/POZ domain-containing protein 12 (BTBD12), is a Holliday junction resolvase subunit that binds multiple DNA repair/recombination endonucleases and is required for DNA repair. Mutations in the SLX4 gene are found in Fanconi anemia. This model corresponds to a conserved region called the SAP domain, which is responsible for the binding of MUS81, which plays a distinct role in interstrand crosslink repair.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",